A key element in success in any field is the willingness and desire to learn new things and grow, and the acceptance of change.
This is why a growth mindset is strongly associated with success.
A fixed mindset can be seen in a person who masters something quickly, and then plateaus and fails to improve further.
The person will either succeed with a task at first try or give up in disappointment.
Their inner voice has already told them that they're either good at or not good at the task at hand.
A growth mindset can be seen in one who learns slowly and gradually, accepting new challenges and solving problems along the way.